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This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

From 7eaba1c3599f414294e5451e472456eed533475b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Esteban=20K=C3=BCber?= <esteban@kuber.com.ar>
Date: Thu, 19 Aug 2021 11:40:00 -0700
Subject: [PATCH] Lint against RTL unicode codepoints in literals and comments
Address CVE-2021-42574.
Backported-by: Josh Stone <jistone@redhat.com>
---
Cargo.lock | 1 +
compiler/rustc_errors/src/emitter.rs | 20 +-
compiler/rustc_lint/src/context.rs | 39 +++-
.../src/hidden_unicode_codepoints.rs | 161 +++++++++++++++
compiler/rustc_lint/src/lib.rs | 3 +
compiler/rustc_lint_defs/src/builtin.rs | 28 +++
compiler/rustc_lint_defs/src/lib.rs | 1 +
compiler/rustc_parse/Cargo.toml | 1 +
compiler/rustc_parse/src/lexer/mod.rs | 40 +++-
.../src/lexer/unescape_error_reporting.rs | 16 +-
.../ui/parser/unicode-control-codepoints.rs | 39 ++++
.../parser/unicode-control-codepoints.stderr | 184 ++++++++++++++++++
12 files changed, 525 insertions(+), 8 deletions(-)
create mode 100644 compiler/rustc_lint/src/hidden_unicode_codepoints.rs
create mode 100644 src/test/ui/parser/unicode-control-codepoints.rs
create mode 100644 src/test/ui/parser/unicode-control-codepoints.stderr
diff --git a/Cargo.lock b/Cargo.lock
index de110c55a4b2..140026dc6ae1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4170,6 +4170,7 @@ dependencies = [
"smallvec",
"tracing",
"unicode-normalization",
+ "unicode-width",
]
[[package]]
diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index d3f92bf3047b..db7bbe58c80c 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -1977,8 +1977,26 @@ fn num_decimal_digits(num: usize) -> usize {
MAX_DIGITS
}
+// We replace some characters so the CLI output is always consistent and underlines aligned.
+const OUTPUT_REPLACEMENTS: &[(char, &str)] = &[
+ ('\t', " "), // We do our own tab replacement
+ ('\u{202A}', ""), // The following unicode text flow control characters are inconsistently
+ ('\u{202B}', ""), // supported accross CLIs and can cause confusion due to the bytes on disk
+ ('\u{202D}', ""), // not corresponding to the visible source code, so we replace them always.
+ ('\u{202E}', ""),
+ ('\u{2066}', ""),
+ ('\u{2067}', ""),
+ ('\u{2068}', ""),
+ ('\u{202C}', ""),
+ ('\u{2069}', ""),
+];
+
fn replace_tabs(str: &str) -> String {
- str.replace('\t', " ")
+ let mut s = str.to_string();
+ for (c, replacement) in OUTPUT_REPLACEMENTS {
+ s = s.replace(*c, replacement);
+ }
+ s
}
fn draw_col_separator(buffer: &mut StyledBuffer, line: usize, col: usize) {
diff --git a/compiler/rustc_lint/src/context.rs b/compiler/rustc_lint/src/context.rs
index a8df1b0952c1..0a2b55dbbada 100644
--- a/compiler/rustc_lint/src/context.rs
+++ b/compiler/rustc_lint/src/context.rs
@@ -16,6 +16,7 @@
use self::TargetLint::*;
+use crate::hidden_unicode_codepoints::UNICODE_TEXT_FLOW_CHARS;
use crate::levels::LintLevelsBuilder;
use crate::passes::{EarlyLintPassObject, LateLintPassObject};
use rustc_ast as ast;
@@ -40,7 +41,7 @@
use rustc_session::Session;
use rustc_session::SessionLintStore;
use rustc_span::lev_distance::find_best_match_for_name;
-use rustc_span::{symbol::Symbol, MultiSpan, Span, DUMMY_SP};
+use rustc_span::{symbol::Symbol, BytePos, MultiSpan, Span, DUMMY_SP};
use rustc_target::abi::LayoutOf;
use tracing::debug;
@@ -601,6 +602,42 @@ fn lookup_with_diagnostics(
// Now, set up surrounding context.
let sess = self.sess();
match diagnostic {
+ BuiltinLintDiagnostics::UnicodeTextFlow(span, content) => {
+ let spans: Vec<_> = content
+ .char_indices()
+ .filter_map(|(i, c)| {
+ UNICODE_TEXT_FLOW_CHARS.contains(&c).then(|| {
+ let lo = span.lo() + BytePos(2 + i as u32);
+ (c, span.with_lo(lo).with_hi(lo + BytePos(c.len_utf8() as u32)))
+ })
+ })
+ .collect();
+ let (an, s) = match spans.len() {
+ 1 => ("an ", ""),
+ _ => ("", "s"),
+ };
+ db.span_label(span, &format!(
+ "this comment contains {}invisible unicode text flow control codepoint{}",
+ an,
+ s,
+ ));
+ for (c, span) in &spans {
+ db.span_label(*span, format!("{:?}", c));
+ }
+ db.note(
+ "these kind of unicode codepoints change the way text flows on \
+ applications that support them, but can cause confusion because they \
+ change the order of characters on the screen",
+ );
+ if !spans.is_empty() {
+ db.multipart_suggestion_with_style(
+ "if their presence wasn't intentional, you can remove them",
+ spans.into_iter().map(|(_, span)| (span, "".to_string())).collect(),
+ Applicability::MachineApplicable,
+ SuggestionStyle::HideCodeAlways,
+ );
+ }
+ },
BuiltinLintDiagnostics::Normal => (),
BuiltinLintDiagnostics::BareTraitObject(span, is_global) => {
let (sugg, app) = match sess.source_map().span_to_snippet(span) {
diff --git a/compiler/rustc_lint/src/hidden_unicode_codepoints.rs b/compiler/rustc_lint/src/hidden_unicode_codepoints.rs
new file mode 100644
index 000000000000..1bcdcb806fc4
--- /dev/null
+++ b/compiler/rustc_lint/src/hidden_unicode_codepoints.rs
@@ -0,0 +1,161 @@
+use crate::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_ast as ast;
+use rustc_errors::{Applicability, SuggestionStyle};
+use rustc_span::{BytePos, Span, Symbol};
+
+declare_lint! {
+ /// The `text_direction_codepoint_in_literal` lint detects Unicode codepoints that change the
+ /// visual representation of text on screen in a way that does not correspond to their on
+ /// memory representation.
+ ///
+ /// ### Explanation
+ ///
+ /// The unicode characters `\u{202A}`, `\u{202B}`, `\u{202D}`, `\u{202E}`, `\u{2066}`,
+ /// `\u{2067}`, `\u{2068}`, `\u{202C}` and `\u{2069}` make the flow of text on screen change
+ /// its direction on software that supports these codepoints. This makes the text "abc" display
+ /// as "cba" on screen. By leveraging software that supports these, people can write specially
+ /// crafted literals that make the surrounding code seem like it's performing one action, when
+ /// in reality it is performing another. Because of this, we proactively lint against their
+ /// presence to avoid surprises.
+ ///
+ /// ### Example
+ ///
+ /// ```rust,compile_fail
+ /// #![deny(text_direction_codepoint_in_literal)]
+ /// fn main() {
+ /// println!("{:?}", '‮');
+ /// }
+ /// ```
+ ///
+ /// {{produces}}
+ ///
+ pub TEXT_DIRECTION_CODEPOINT_IN_LITERAL,
+ Deny,
+ "detect special Unicode codepoints that affect the visual representation of text on screen, \
+ changing the direction in which text flows",
+}
+
+declare_lint_pass!(HiddenUnicodeCodepoints => [TEXT_DIRECTION_CODEPOINT_IN_LITERAL]);
+
+crate const UNICODE_TEXT_FLOW_CHARS: &[char] = &[
+ '\u{202A}', '\u{202B}', '\u{202D}', '\u{202E}', '\u{2066}', '\u{2067}', '\u{2068}', '\u{202C}',
+ '\u{2069}',
+];
+
+impl HiddenUnicodeCodepoints {
+ fn lint_text_direction_codepoint(
+ &self,
+ cx: &EarlyContext<'_>,
+ text: Symbol,
+ span: Span,
+ padding: u32,
+ point_at_inner_spans: bool,
+ label: &str,
+ ) {
+ // Obtain the `Span`s for each of the forbidden chars.
+ let spans: Vec<_> = text
+ .as_str()
+ .char_indices()
+ .filter_map(|(i, c)| {
+ UNICODE_TEXT_FLOW_CHARS.contains(&c).then(|| {
+ let lo = span.lo() + BytePos(i as u32 + padding);
+ (c, span.with_lo(lo).with_hi(lo + BytePos(c.len_utf8() as u32)))
+ })
+ })
+ .collect();
+
+ cx.struct_span_lint(TEXT_DIRECTION_CODEPOINT_IN_LITERAL, span, |lint| {
+ let mut err = lint.build(&format!(
+ "unicode codepoint changing visible direction of text present in {}",
+ label
+ ));
+ let (an, s) = match spans.len() {
+ 1 => ("an ", ""),
+ _ => ("", "s"),
+ };
+ err.span_label(
+ span,
+ &format!(
+ "this {} contains {}invisible unicode text flow control codepoint{}",
+ label, an, s,
+ ),
+ );
+ if point_at_inner_spans {
+ for (c, span) in &spans {
+ err.span_label(*span, format!("{:?}", c));
+ }
+ }
+ err.note(
+ "these kind of unicode codepoints change the way text flows on applications that \
+ support them, but can cause confusion because they change the order of \
+ characters on the screen",
+ );
+ if point_at_inner_spans && !spans.is_empty() {
+ err.multipart_suggestion_with_style(
+ "if their presence wasn't intentional, you can remove them",
+ spans.iter().map(|(_, span)| (*span, "".to_string())).collect(),
+ Applicability::MachineApplicable,
+ SuggestionStyle::HideCodeAlways,
+ );
+ err.multipart_suggestion(
+ "if you want to keep them but make them visible in your source code, you can \
+ escape them",
+ spans
+ .into_iter()
+ .map(|(c, span)| {
+ let c = format!("{:?}", c);
+ (span, c[1..c.len() - 1].to_string())
+ })
+ .collect(),
+ Applicability::MachineApplicable,
+ );
+ } else {
+ // FIXME: in other suggestions we've reversed the inner spans of doc comments. We
+ // should do the same here to provide the same good suggestions as we do for
+ // literals above.
+ err.note("if their presence wasn't intentional, you can remove them");
+ err.note(&format!(
+ "if you want to keep them but make them visible in your source code, you can \
+ escape them: {}",
+ spans
+ .into_iter()
+ .map(|(c, _)| { format!("{:?}", c) })
+ .collect::<Vec<String>>()
+ .join(", "),
+ ));
+ }
+ err.emit();
+ });
+ }
+}
+impl EarlyLintPass for HiddenUnicodeCodepoints {
+ fn check_attribute(&mut self, cx: &EarlyContext<'_>, attr: &ast::Attribute) {
+ if let ast::AttrKind::DocComment(_, comment) = attr.kind {
+ if comment.as_str().contains(UNICODE_TEXT_FLOW_CHARS) {
+ self.lint_text_direction_codepoint(cx, comment, attr.span, 0, false, "doc comment");
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &ast::Expr) {
+ // byte strings are already handled well enough by `EscapeError::NonAsciiCharInByteString`
+ let (text, span, padding) = match &expr.kind {
+ ast::ExprKind::Lit(ast::Lit { token, kind, span }) => {
+ let text = token.symbol;
+ if !text.as_str().contains(UNICODE_TEXT_FLOW_CHARS) {
+ return;
+ }
+ let padding = match kind {
+ // account for `"` or `'`
+ ast::LitKind::Str(_, ast::StrStyle::Cooked) | ast::LitKind::Char(_) => 1,
+ // account for `r###"`
+ ast::LitKind::Str(_, ast::StrStyle::Raw(val)) => *val as u32 + 2,
+ _ => return,
+ };
+ (text, span, padding)
+ }
+ _ => return,
+ };
+ self.lint_text_direction_codepoint(cx, text, *span, padding, true, "literal");
+ }
+}
diff --git a/compiler/rustc_lint/src/lib.rs b/compiler/rustc_lint/src/lib.rs
index 4f59460aa82a..89612eb72b48 100644
--- a/compiler/rustc_lint/src/lib.rs
+++ b/compiler/rustc_lint/src/lib.rs
@@ -48,6 +48,7 @@
pub mod builtin;
mod context;
mod early;
+pub mod hidden_unicode_codepoints;
mod internal;
mod late;
mod levels;
@@ -75,6 +76,7 @@
use array_into_iter::ArrayIntoIter;
use builtin::*;
+use hidden_unicode_codepoints::*;
use internal::*;
use methods::*;
use non_ascii_idents::*;
@@ -126,6 +128,7 @@ macro_rules! early_lint_passes {
DeprecatedAttr: DeprecatedAttr::new(),
WhileTrue: WhileTrue,
NonAsciiIdents: NonAsciiIdents,
+ HiddenUnicodeCodepoints: HiddenUnicodeCodepoints,
IncompleteFeatures: IncompleteFeatures,
RedundantSemicolons: RedundantSemicolons,
UnusedDocComment: UnusedDocComment,
diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs
index 352146d64635..cd4d5c6e5f1c 100644
--- a/compiler/rustc_lint_defs/src/builtin.rs
+++ b/compiler/rustc_lint_defs/src/builtin.rs
@@ -3240,3 +3240,31 @@
Allow,
"detects usage of old versions of or-patterns",
}
+
+declare_lint! {
+ /// The `text_direction_codepoint_in_comment` lint detects Unicode codepoints in comments that
+ /// change the visual representation of text on screen in a way that does not correspond to
+ /// their on memory representation.
+ ///
+ /// ### Example
+ ///
+ /// ```rust,compile_fail
+ /// #![deny(text_direction_codepoint_in_comment)]
+ /// fn main() {
+ /// println!("{:?}"); // '‮');
+ /// }
+ /// ```
+ ///
+ /// {{produces}}
+ ///
+ /// ### Explanation
+ ///
+ /// Unicode allows changing the visual flow of text on screen in order to support scripts that
+ /// are written right-to-left, but a specially crafted comment can make code that will be
+ /// compiled appear to be part of a comment, depending on the software used to read the code.
+ /// To avoid potential problems or confusion, such as in CVE-2021-42574, by default we deny
+ /// their use.
+ pub TEXT_DIRECTION_CODEPOINT_IN_COMMENT,
+ Deny,
+ "invisible directionality-changing codepoints in comment"
+}
diff --git a/compiler/rustc_lint_defs/src/lib.rs b/compiler/rustc_lint_defs/src/lib.rs
index f1c4e5fb4a36..1ec50fe5fbb5 100644
--- a/compiler/rustc_lint_defs/src/lib.rs
+++ b/compiler/rustc_lint_defs/src/lib.rs
@@ -272,6 +272,7 @@ pub enum BuiltinLintDiagnostics {
ExternDepSpec(String, ExternDepSpec),
ProcMacroBackCompat(String),
OrPatternsBackCompat(Span, String),
+ UnicodeTextFlow(Span, String),
}
/// Lints that are buffered up early on in the `Session` before the
diff --git a/compiler/rustc_parse/Cargo.toml b/compiler/rustc_parse/Cargo.toml
index c887729c3557..96a215628dfb 100644
--- a/compiler/rustc_parse/Cargo.toml
+++ b/compiler/rustc_parse/Cargo.toml
@@ -19,4 +19,5 @@ rustc_session = { path = "../rustc_session" }
rustc_span = { path = "../rustc_span" }
rustc_ast = { path = "../rustc_ast" }
unicode-normalization = "0.1.11"
+unicode-width = "0.1.4"
smallvec = { version = "1.6.1", features = ["union", "may_dangle"] }
diff --git a/compiler/rustc_parse/src/lexer/mod.rs b/compiler/rustc_parse/src/lexer/mod.rs
index 1c2f9a9645fe..97a9a5aee42a 100644
--- a/compiler/rustc_parse/src/lexer/mod.rs
+++ b/compiler/rustc_parse/src/lexer/mod.rs
@@ -1,9 +1,11 @@
-use rustc_ast::ast::AttrStyle;
+use rustc_ast::ast::{self, AttrStyle};
use rustc_ast::token::{self, CommentKind, Token, TokenKind};
use rustc_ast::tokenstream::{Spacing, TokenStream};
use rustc_errors::{error_code, Applicability, DiagnosticBuilder, FatalError, PResult};
use rustc_lexer::unescape::{self, Mode};
use rustc_lexer::{Base, DocStyle, RawStrError};
+use rustc_session::lint::builtin::TEXT_DIRECTION_CODEPOINT_IN_COMMENT;
+use rustc_session::lint::BuiltinLintDiagnostics;
use rustc_session::parse::ParseSess;
use rustc_span::symbol::{sym, Symbol};
use rustc_span::{BytePos, Pos, Span};
@@ -127,6 +129,28 @@ fn struct_fatal_span_char(
.struct_span_fatal(self.mk_sp(from_pos, to_pos), &format!("{}: {}", m, escaped_char(c)))
}
+ /// Detect usages of Unicode codepoints changing the direction of the text on screen and loudly
+ /// complain about it.
+ fn lint_unicode_text_flow(&self, start: BytePos) {
+ // Opening delimiter of the length 2 is not included into the comment text.
+ let content_start = start + BytePos(2);
+ let content = self.str_from(content_start);
+ let span = self.mk_sp(start, self.pos);
+ const UNICODE_TEXT_FLOW_CHARS: &[char] = &[
+ '\u{202A}', '\u{202B}', '\u{202D}', '\u{202E}', '\u{2066}', '\u{2067}', '\u{2068}',
+ '\u{202C}', '\u{2069}',
+ ];
+ if content.contains(UNICODE_TEXT_FLOW_CHARS) {
+ self.sess.buffer_lint_with_diagnostic(
+ &TEXT_DIRECTION_CODEPOINT_IN_COMMENT,
+ span,
+ ast::CRATE_NODE_ID,
+ "unicode codepoint changing visible direction of text present in comment",
+ BuiltinLintDiagnostics::UnicodeTextFlow(span, content.to_string()),
+ );
+ }
+ }
+
/// Turns simple `rustc_lexer::TokenKind` enum into a rich
/// `rustc_ast::TokenKind`. This turns strings into interned
/// symbols and runs additional validation.
@@ -134,7 +158,12 @@ fn cook_lexer_token(&self, token: rustc_lexer::TokenKind, start: BytePos) -> Opt
Some(match token {
rustc_lexer::TokenKind::LineComment { doc_style } => {
// Skip non-doc comments
- let doc_style = doc_style?;
+ let doc_style = if let Some(doc_style) = doc_style {
+ doc_style
+ } else {
+ self.lint_unicode_text_flow(start);
+ return None;
+ };
// Opening delimiter of the length 3 is not included into the symbol.
let content_start = start + BytePos(3);
@@ -156,7 +185,12 @@ fn cook_lexer_token(&self, token: rustc_lexer::TokenKind, start: BytePos) -> Opt
}
// Skip non-doc comments
- let doc_style = doc_style?;
+ let doc_style = if let Some(doc_style) = doc_style {
+ doc_style
+ } else {
+ self.lint_unicode_text_flow(start);
+ return None;
+ };
// Opening delimiter of the length 3 and closing delimiter of the length 2
// are not included into the symbol.
diff --git a/compiler/rustc_parse/src/lexer/unescape_error_reporting.rs b/compiler/rustc_parse/src/lexer/unescape_error_reporting.rs
index a580f0c55d0e..1e673e03d67f 100644
--- a/compiler/rustc_parse/src/lexer/unescape_error_reporting.rs
+++ b/compiler/rustc_parse/src/lexer/unescape_error_reporting.rs
@@ -153,9 +153,14 @@ pub(crate) fn emit_unescape_error(
EscapeError::NonAsciiCharInByte => {
assert!(mode.is_bytes());
let (c, span) = last_char();
+ let postfix = if unicode_width::UnicodeWidthChar::width(c).unwrap_or(1) == 0 {
+ format!(" but is {:?}", c)
+ } else {
+ String::new()
+ };
handler
.struct_span_err(span, "non-ASCII character in byte constant")
- .span_label(span, "byte constant must be ASCII")
+ .span_label(span, &format!("byte constant must be ASCII{}", postfix))
.span_suggestion(
span,
"use a \\xHH escape for a non-ASCII byte",
@@ -166,10 +171,15 @@ pub(crate) fn emit_unescape_error(
}
EscapeError::NonAsciiCharInByteString => {
assert!(mode.is_bytes());
- let (_c, span) = last_char();
+ let (c, span) = last_char();
+ let postfix = if unicode_width::UnicodeWidthChar::width(c).unwrap_or(1) == 0 {
+ format!(" but is {:?}", c)
+ } else {
+ String::new()
+ };
handler
.struct_span_err(span, "raw byte string must be ASCII")
- .span_label(span, "must be ASCII")
+ .span_label(span, &format!("must be ASCII{}", postfix))
.emit();
}
EscapeError::OutOfRangeHexEscape => {
diff --git a/src/test/ui/parser/unicode-control-codepoints.rs b/src/test/ui/parser/unicode-control-codepoints.rs
new file mode 100644
index 000000000000..5af0b585a127
--- /dev/null
+++ b/src/test/ui/parser/unicode-control-codepoints.rs
@@ -0,0 +1,39 @@
+fn main() {
+ // if access_level != "us‫e‪r" { // Check if admin
+ //~^ ERROR unicode codepoint changing visible direction of text present in comment
+ println!("us\u{202B}e\u{202A}r");
+ println!("{:?}", r#"us\u{202B}e\u{202A}r"#);
+ println!("{:?}", b"us\u{202B}e\u{202A}r");
+ //~^ ERROR unicode escape in byte string
+ //~| ERROR unicode escape in byte string
+ println!("{:?}", br##"us\u{202B}e\u{202A}r"##);
+
+ println!("{:?}", "/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only ");
+ //~^ ERROR unicode codepoint changing visible direction of text present in literal
+
+ println!("{:?}", r##"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only "##);
+ //~^ ERROR unicode codepoint changing visible direction of text present in literal
+ println!("{:?}", b"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only ");
+ //~^ ERROR non-ASCII character in byte constant
+ //~| ERROR non-ASCII character in byte constant
+ //~| ERROR non-ASCII character in byte constant
+ //~| ERROR non-ASCII character in byte constant
+ println!("{:?}", br##"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only "##);
+ //~^ ERROR raw byte string must be ASCII
+ //~| ERROR raw byte string must be ASCII
+ //~| ERROR raw byte string must be ASCII
+ //~| ERROR raw byte string must be ASCII
+ println!("{:?}", '‮');
+ //~^ ERROR unicode codepoint changing visible direction of text present in literal
+}
+
+//"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only */"
+//~^ ERROR unicode codepoint changing visible direction of text present in comment
+
+/** '‮'); */fn foo() {}
+//~^ ERROR unicode codepoint changing visible direction of text present in doc comment
+
+/**
+ *
+ * '‮'); */fn bar() {}
+//~^^^ ERROR unicode codepoint changing visible direction of text present in doc comment
diff --git a/src/test/ui/parser/unicode-control-codepoints.stderr b/src/test/ui/parser/unicode-control-codepoints.stderr
new file mode 100644
index 000000000000..650cc74feed0
--- /dev/null
+++ b/src/test/ui/parser/unicode-control-codepoints.stderr
@@ -0,0 +1,184 @@
+error: unicode escape in byte string
+ --> $DIR/unicode-control-codepoints.rs:6:26
+ |
+LL | println!("{:?}", b"us\u{202B}e\u{202A}r");
+ | ^^^^^^^^ unicode escape in byte string
+ |
+ = help: unicode escape sequences cannot be used as a byte or in a byte string
+
+error: unicode escape in byte string
+ --> $DIR/unicode-control-codepoints.rs:6:35
+ |
+LL | println!("{:?}", b"us\u{202B}e\u{202A}r");
+ | ^^^^^^^^ unicode escape in byte string
+ |
+ = help: unicode escape sequences cannot be used as a byte or in a byte string
+
+error: non-ASCII character in byte constant
+ --> $DIR/unicode-control-codepoints.rs:16:26
+ |
+LL | println!("{:?}", b"/* } if isAdmin begin admins only ");
+ | ^
+ | |
+ | byte constant must be ASCII but is '\u{202e}'
+ | help: use a \xHH escape for a non-ASCII byte: `\x202E`
+
+error: non-ASCII character in byte constant
+ --> $DIR/unicode-control-codepoints.rs:16:30
+ |
+LL | println!("{:?}", b"/* } if isAdmin begin admins only ");
+ | ^
+ | |
+ | byte constant must be ASCII but is '\u{2066}'
+ | help: use a \xHH escape for a non-ASCII byte: `\x2066`
+
+error: non-ASCII character in byte constant
+ --> $DIR/unicode-control-codepoints.rs:16:41
+ |
+LL | println!("{:?}", b"/* } if isAdmin begin admins only ");
+ | ^
+ | |
+ | byte constant must be ASCII but is '\u{2069}'
+ | help: use a \xHH escape for a non-ASCII byte: `\x2069`
+
+error: non-ASCII character in byte constant
+ --> $DIR/unicode-control-codepoints.rs:16:43
+ |
+LL | println!("{:?}", b"/* } if isAdmin begin admins only ");
+ | ^
+ | |
+ | byte constant must be ASCII but is '\u{2066}'
+ | help: use a \xHH escape for a non-ASCII byte: `\x2066`
+
+error: raw byte string must be ASCII
+ --> $DIR/unicode-control-codepoints.rs:21:29
+ |
+LL | println!("{:?}", br##"/* } if isAdmin begin admins only "##);
+ | ^ must be ASCII but is '\u{202e}'
+
+error: raw byte string must be ASCII
+ --> $DIR/unicode-control-codepoints.rs:21:33
+ |
+LL | println!("{:?}", br##"/* } if isAdmin begin admins only "##);
+ | ^ must be ASCII but is '\u{2066}'
+
+error: raw byte string must be ASCII
+ --> $DIR/unicode-control-codepoints.rs:21:44
+ |
+LL | println!("{:?}", br##"/* } if isAdmin begin admins only "##);
+ | ^ must be ASCII but is '\u{2069}'
+
+error: raw byte string must be ASCII
+ --> $DIR/unicode-control-codepoints.rs:21:46
+ |
+LL | println!("{:?}", br##"/* } if isAdmin begin admins only "##);
+ | ^ must be ASCII but is '\u{2066}'
+
+error: unicode codepoint changing visible direction of text present in comment
+ --> $DIR/unicode-control-codepoints.rs:2:5
+ |
+LL | // if access_level != "user" { // Check if admin
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^--^^^^^^^^^^^^^^^^^^^^^
+ | | ||
+ | | |'\u{202a}'
+ | | '\u{202b}'
+ | this comment contains invisible unicode text flow control codepoints
+ |
+ = note: `#[deny(text_direction_codepoint_in_comment)]` on by default
+ = note: these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
+ = help: if their presence wasn't intentional, you can remove them
+
+error: unicode codepoint changing visible direction of text present in comment
+ --> $DIR/unicode-control-codepoints.rs:30:1
+ |
+LL | //"/* } if isAdmin begin admins only */"
+ | ^^^^^-^^-^^^^^^^^^--^^^^^^^^^^^^^^^^^^^^^
+ | | | | ||
+ | | | | |'\u{2066}'
+ | | | | '\u{2069}'
+ | | | '\u{2066}'
+ | | '\u{202e}'
+ | this comment contains invisible unicode text flow control codepoints
+ |
+ = note: these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
+ = help: if their presence wasn't intentional, you can remove them
+
+error: unicode codepoint changing visible direction of text present in literal
+ --> $DIR/unicode-control-codepoints.rs:11:22
+ |
+LL | println!("{:?}", "/* } if isAdmin begin admins only ");
+ | ^^^-^^-^^^^^^^^^--^^^^^^^^^^^^^^^^^^^
+ | | | | ||
+ | | | | |'\u{2066}'
+ | | | | '\u{2069}'
+ | | | '\u{2066}'
+ | | '\u{202e}'
+ | this literal contains invisible unicode text flow control codepoints
+ |
+ = note: `#[deny(text_direction_codepoint_in_literal)]` on by default
+ = note: these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
+ = help: if their presence wasn't intentional, you can remove them
+help: if you want to keep them but make them visible in your source code, you can escape them
+ |
+LL | println!("{:?}", "/*\u{202e} } \u{2066}if isAdmin\u{2069} \u{2066} begin admins only ");
+ | ^^^^^^^^ ^^^^^^^^ ^^^^^^^^ ^^^^^^^^
+
+error: unicode codepoint changing visible direction of text present in literal
+ --> $DIR/unicode-control-codepoints.rs:14:22
+ |
+LL | println!("{:?}", r##"/* } if isAdmin begin admins only "##);
+ | ^^^^^^-^^-^^^^^^^^^--^^^^^^^^^^^^^^^^^^^^^
+ | | | | ||
+ | | | | |'\u{2066}'
+ | | | | '\u{2069}'
+ | | | '\u{2066}'
+ | | '\u{202e}'
+ | this literal contains invisible unicode text flow control codepoints
+ |
+ = note: these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
+ = help: if their presence wasn't intentional, you can remove them
+help: if you want to keep them but make them visible in your source code, you can escape them
+ |
+LL | println!("{:?}", r##"/*\u{202e} } \u{2066}if isAdmin\u{2069} \u{2066} begin admins only "##);
+ | ^^^^^^^^ ^^^^^^^^ ^^^^^^^^ ^^^^^^^^
+
+error: unicode codepoint changing visible direction of text present in literal
+ --> $DIR/unicode-control-codepoints.rs:26:22
+ |
+LL | println!("{:?}", '');
+ | ^-
+ | ||
+ | |'\u{202e}'
+ | this literal contains an invisible unicode text flow control codepoint
+ |
+ = note: these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
+ = help: if their presence wasn't intentional, you can remove them
+help: if you want to keep them but make them visible in your source code, you can escape them
+ |
+LL | println!("{:?}", '\u{202e}');
+ | ^^^^^^^^
+
+error: unicode codepoint changing visible direction of text present in doc comment
+ --> $DIR/unicode-control-codepoints.rs:33:1
+ |
+LL | /** ''); */fn foo() {}
+ | ^^^^^^^^^^^^ this doc comment contains an invisible unicode text flow control codepoint
+ |
+ = note: these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
+ = note: if their presence wasn't intentional, you can remove them
+ = note: if you want to keep them but make them visible in your source code, you can escape them: '\u{202e}'
+
+error: unicode codepoint changing visible direction of text present in doc comment
+ --> $DIR/unicode-control-codepoints.rs:36:1
+ |
+LL | / /**
+LL | | *
+LL | | * ''); */fn bar() {}
+ | |___________^ this doc comment contains an invisible unicode text flow control codepoint
+ |
+ = note: these kind of unicode codepoints change the way text flows on applications that support them, but can cause confusion because they change the order of characters on the screen
+ = note: if their presence wasn't intentional, you can remove them
+ = note: if you want to keep them but make them visible in your source code, you can escape them: '\u{202e}'
+
+error: aborting due to 17 previous errors
+
--
2.31.1
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